自适应短波通信系统跳频信号时差定位方法

短波通信在拓宽应用广泛性与普适性的同时,也存在信号跳频与难以监管问题。以自适应短波通信系统为研究对象,提出一种跳频信号时差定位方法。分析自适应短波通信系统的天波传输信道电离层特性、短波传播形式与跳频信号特点,利用离散频谱与傅里叶基,构建基于平坦衰落信道的跳频信号定位模型,根据架构的模型似然函数与互相关函数矩阵,获取目标方位定位最大似然估计,实现跳频信号时差定位。采用三个信号接收站与一个控制处理中心构成自适应短波通信系统,经过外场试验环境,展开信号源信号与无人机遥控跳频信号的时差定位试验,依据对比实验结果可知,所提方法能够有效定位目标信号,且定位精度具有显著的优越性,验证了方法的正确性与可行性,并为日后的研究工作提供了一定的参考价值。

Time Difference Positioning Method for Frequency Hopping Signal of Adaptive Shortwave Communication System

Generally,there are some defects in shortwave communication,such as signal frequency modulation and difficulty in supervision.In this regard,a novel time difference location method for frequency hopping signal is proposed in this paper.The ionospheric characteristics,short wave propagation forms and frequency hopping signal characteristics of the sky wave transmission channel in the self-adaptive shortwave communication system were analyzed.The location model of frequency hopping signal based on flat fading channel was founded via established by the use of discrete spectrum and Fourier basis.Based on the model likelihood function and cross-correlation function matrix of the architecture,the maximum likelihood estimation of the target azimuth location was obtained,thus achieving the time difference location method of frequency hopping signal.The self-adaptive shortwave communication system consisted of three signal receiving stations and a control and processing center.The time difference location test of signal source signal and UAV remote frequency hopping signal was carried out for verifying the effectiveness of the method in our work.The results show that the method can effectively locate the target signal,and has high positioning accuracy,showing the correctness and feasibility of the method,and providing a theoretical basis for future research work.